drivers/platform/x86/hp-wmi.c

   1 /*
   2  * HP WMI hotkeys
   3  *
   4  * Copyright (C) 2008 Red Hat <mjg@redhat.com>
   5  *
   6  * Portions based on wistron_btns.c:
   7  * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
   8  * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
   9  * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this program; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/input.h>
  31 #include <acpi/acpi_drivers.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/acpi.h>
  34 #include <linux/rfkill.h>
  35 #include <linux/string.h>
  36
  37 MODULE_AUTHOR("Matthew Garrett <mjg59@srcf.ucam.org>");
  38 MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
  39 MODULE_LICENSE("GPL");
  40
  41 MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
  42 MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
  43
  44 #define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
  45 #define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"
  46
  47 #define HPWMI_DISPLAY_QUERY 0x1
  48 #define HPWMI_HDDTEMP_QUERY 0x2
  49 #define HPWMI_ALS_QUERY 0x3
  50 #define HPWMI_HARDWARE_QUERY 0x4
  51 #define HPWMI_WIRELESS_QUERY 0x5
  52 #define HPWMI_HOTKEY_QUERY 0xc
  53
  54 static int __init hp_wmi_bios_setup(struct platform_device *device);
  55 static int __exit hp_wmi_bios_remove(struct platform_device *device);
  56 static int hp_wmi_resume_handler(struct device *device);
  57
  58 struct bios_args {
  59         u32 signature;
  60         u32 command;
  61         u32 commandtype;
  62         u32 datasize;
  63         u32 data;
  64 };
  65
  66 struct bios_return {
  67         u32 sigpass;
  68         u32 return_code;
  69         u32 value;
  70 };
  71
  72 struct key_entry {
  73         char type;              /* See KE_* below */
  74         u16 code;
  75         u16 keycode;
  76 };
  77
  78 enum { KE_KEY, KE_END };
  79
  80 static struct key_entry hp_wmi_keymap[] = {
  81         {KE_KEY, 0x02, KEY_BRIGHTNESSUP},
  82         {KE_KEY, 0x03, KEY_BRIGHTNESSDOWN},
  83         {KE_KEY, 0x20e6, KEY_PROG1},
  84         {KE_KEY, 0x2142, KEY_MEDIA},
  85         {KE_KEY, 0x213b, KEY_INFO},
  86         {KE_KEY, 0x231b, KEY_HELP},
  87         {KE_END, 0}
  88 };
  89
  90 static struct input_dev *hp_wmi_input_dev;
  91 static struct platform_device *hp_wmi_platform_dev;
  92
  93 static struct rfkill *wifi_rfkill;
  94 static struct rfkill *bluetooth_rfkill;
  95 static struct rfkill *wwan_rfkill;
  96
  97 static struct dev_pm_ops hp_wmi_pm_ops = {
  98         .resume  = hp_wmi_resume_handler,
  99         .restore  = hp_wmi_resume_handler,
 100 };
 101
 102 static struct platform_driver hp_wmi_driver = {
 103         .driver = {
 104                 .name = "hp-wmi",
 105                 .owner = THIS_MODULE,
 106                 .pm = &hp_wmi_pm_ops,
 107         },
 108         .probe = hp_wmi_bios_setup,
 109         .remove = hp_wmi_bios_remove,
 110 };
 111
 112 static int hp_wmi_perform_query(int query, int write, int value)
 113 {
 114         struct bios_return bios_return;
 115         acpi_status status;
 116         union acpi_object *obj;
 117         struct bios_args args = {
 118                 .signature = 0x55434553,
 119                 .command = write ? 0x2 : 0x1,
 120                 .commandtype = query,
 121                 .datasize = write ? 0x4 : 0,
 122                 .data = value,
 123         };
 124         struct acpi_buffer input = { sizeof(struct bios_args), &args };
 125         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 126
 127         status = wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);
 128
 129         obj = output.pointer;
 130
 131         if (!obj || obj->type != ACPI_TYPE_BUFFER)
 132                 return -EINVAL;
 133
 134         bios_return = *((struct bios_return *)obj->buffer.pointer);
 135         if (bios_return.return_code > 0)
 136                 return bios_return.return_code * -1;
 137         else
 138                 return bios_return.value;
 139 }
 140
 141 static int hp_wmi_display_state(void)
 142 {
 143         return hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, 0);
 144 }
 145
 146 static int hp_wmi_hddtemp_state(void)
 147 {
 148         return hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, 0);
 149 }
 150
 151 static int hp_wmi_als_state(void)
 152 {
 153         return hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, 0);
 154 }
 155
 156 static int hp_wmi_dock_state(void)
 157 {
 158         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 159
 160         if (ret < 0)
 161                 return ret;
 162
 163         return ret & 0x1;
 164 }
 165
 166 static int hp_wmi_tablet_state(void)
 167 {
 168         int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, 0);
 169
 170         if (ret < 0)
 171                 return ret;
 172
 173         return (ret & 0x4) ? 1 : 0;
 174 }
 175
 176 static int hp_wmi_set_block(void *data, bool blocked)
 177 {
 178         unsigned long b = (unsigned long) data;
 179         int query = BIT(b + 8) | ((!blocked) << b);
 180
 181         return hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1, query);
 182 }
 183
 184 static const struct rfkill_ops hp_wmi_rfkill_ops = {
 185         .set_block = hp_wmi_set_block,
 186 };
 187
 188 static bool hp_wmi_wifi_state(void)
 189 {
 190         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 191
 192         if (wireless & 0x100)
 193                 return false;
 194         else
 195                 return true;
 196 }
 197
 198 static bool hp_wmi_bluetooth_state(void)
 199 {
 200         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 201
 202         if (wireless & 0x10000)
 203                 return false;
 204         else
 205                 return true;
 206 }
 207
 208 static bool hp_wmi_wwan_state(void)
 209 {
 210         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 211
 212         if (wireless & 0x1000000)
 213                 return false;
 214         else
 215                 return true;
 216 }
 217
 218 static ssize_t show_display(struct device *dev, struct device_attribute *attr,
 219                             char *buf)
 220 {
 221         int value = hp_wmi_display_state();
 222         if (value < 0)
 223                 return -EINVAL;
 224         return sprintf(buf, "%d\n", value);
 225 }
 226
 227 static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
 228                             char *buf)
 229 {
 230         int value = hp_wmi_hddtemp_state();
 231         if (value < 0)
 232                 return -EINVAL;
 233         return sprintf(buf, "%d\n", value);
 234 }
 235
 236 static ssize_t show_als(struct device *dev, struct device_attribute *attr,
 237                         char *buf)
 238 {
 239         int value = hp_wmi_als_state();
 240         if (value < 0)
 241                 return -EINVAL;
 242         return sprintf(buf, "%d\n", value);
 243 }
 244
 245 static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
 246                          char *buf)
 247 {
 248         int value = hp_wmi_dock_state();
 249         if (value < 0)
 250                 return -EINVAL;
 251         return sprintf(buf, "%d\n", value);
 252 }
 253
 254 static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
 255                          char *buf)
 256 {
 257         int value = hp_wmi_tablet_state();
 258         if (value < 0)
 259                 return -EINVAL;
 260         return sprintf(buf, "%d\n", value);
 261 }
 262
 263 static ssize_t set_als(struct device *dev, struct device_attribute *attr,
 264                        const char *buf, size_t count)
 265 {
 266         u32 tmp = simple_strtoul(buf, NULL, 10);
 267         hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, tmp);
 268         return count;
 269 }
 270
 271 static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
 272 static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
 273 static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
 274 static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
 275 static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);
 276
 277 static struct key_entry *hp_wmi_get_entry_by_scancode(int code)
 278 {
 279         struct key_entry *key;
 280
 281         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 282                 if (code == key->code)
 283                         return key;
 284
 285         return NULL;
 286 }
 287
 288 static struct key_entry *hp_wmi_get_entry_by_keycode(int keycode)
 289 {
 290         struct key_entry *key;
 291
 292         for (key = hp_wmi_keymap; key->type != KE_END; key++)
 293                 if (key->type == KE_KEY && keycode == key->keycode)
 294                         return key;
 295
 296         return NULL;
 297 }
 298
 299 static int hp_wmi_getkeycode(struct input_dev *dev, int scancode, int *keycode)
 300 {
 301         struct key_entry *key = hp_wmi_get_entry_by_scancode(scancode);
 302
 303         if (key && key->type == KE_KEY) {
 304                 *keycode = key->keycode;
 305                 return 0;
 306         }
 307
 308         return -EINVAL;
 309 }
 310
 311 static int hp_wmi_setkeycode(struct input_dev *dev, int scancode, int keycode)
 312 {
 313         struct key_entry *key;
 314         int old_keycode;
 315
 316         if (keycode < 0 || keycode > KEY_MAX)
 317                 return -EINVAL;
 318
 319         key = hp_wmi_get_entry_by_scancode(scancode);
 320         if (key && key->type == KE_KEY) {
 321                 old_keycode = key->keycode;
 322                 key->keycode = keycode;
 323                 set_bit(keycode, dev->keybit);
 324                 if (!hp_wmi_get_entry_by_keycode(old_keycode))
 325                         clear_bit(old_keycode, dev->keybit);
 326                 return 0;
 327         }
 328
 329         return -EINVAL;
 330 }
 331
 332 static void hp_wmi_notify(u32 value, void *context)
 333 {
 334         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
 335         static struct key_entry *key;
 336         union acpi_object *obj;
 337
 338         wmi_get_event_data(value, &response);
 339
 340         obj = (union acpi_object *)response.pointer;
 341
 342         if (obj && obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == 8) {
 343                 int eventcode = *((u8 *) obj->buffer.pointer);
 344                 if (eventcode == 0x4)
 345                         eventcode = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
 346                                                          0);
 347                 key = hp_wmi_get_entry_by_scancode(eventcode);
 348                 if (key) {
 349                         switch (key->type) {
 350                         case KE_KEY:
 351                                 input_report_key(hp_wmi_input_dev,
 352                                                  key->keycode, 1);
 353                                 input_sync(hp_wmi_input_dev);
 354                                 input_report_key(hp_wmi_input_dev,
 355                                                  key->keycode, 0);
 356                                 input_sync(hp_wmi_input_dev);
 357                                 break;
 358                         }
 359                 } else if (eventcode == 0x1) {
 360                         input_report_switch(hp_wmi_input_dev, SW_DOCK,
 361                                             hp_wmi_dock_state());
 362                         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 363                                             hp_wmi_tablet_state());
 364                         input_sync(hp_wmi_input_dev);
 365                 } else if (eventcode == 0x5) {
 366                         if (wifi_rfkill)
 367                                 rfkill_set_sw_state(wifi_rfkill,
 368                                                     hp_wmi_wifi_state());
 369                         if (bluetooth_rfkill)
 370                                 rfkill_set_sw_state(bluetooth_rfkill,
 371                                                     hp_wmi_bluetooth_state());
 372                         if (wwan_rfkill)
 373                                 rfkill_set_sw_state(wwan_rfkill,
 374                                                     hp_wmi_wwan_state());
 375                 } else
 376                         printk(KERN_INFO "HP WMI: Unknown key pressed - %x\n",
 377                                eventcode);
 378         } else
 379                 printk(KERN_INFO "HP WMI: Unknown response received\n");
 380 }
 381
 382 static int __init hp_wmi_input_setup(void)
 383 {
 384         struct key_entry *key;
 385         int err;
 386
 387         hp_wmi_input_dev = input_allocate_device();
 388
 389         hp_wmi_input_dev->name = "HP WMI hotkeys";
 390         hp_wmi_input_dev->phys = "wmi/input0";
 391         hp_wmi_input_dev->id.bustype = BUS_HOST;
 392         hp_wmi_input_dev->getkeycode = hp_wmi_getkeycode;
 393         hp_wmi_input_dev->setkeycode = hp_wmi_setkeycode;
 394
 395         for (key = hp_wmi_keymap; key->type != KE_END; key++) {
 396                 switch (key->type) {
 397                 case KE_KEY:
 398                         set_bit(EV_KEY, hp_wmi_input_dev->evbit);
 399                         set_bit(key->keycode, hp_wmi_input_dev->keybit);
 400                         break;
 401                 }
 402         }
 403
 404         set_bit(EV_SW, hp_wmi_input_dev->evbit);
 405         set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
 406         set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);
 407
 408         /* Set initial hardware state */
 409         input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
 410         input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 411                             hp_wmi_tablet_state());
 412         input_sync(hp_wmi_input_dev);
 413
 414         err = input_register_device(hp_wmi_input_dev);
 415
 416         if (err) {
 417                 input_free_device(hp_wmi_input_dev);
 418                 return err;
 419         }
 420
 421         return 0;
 422 }
 423
 424 static void cleanup_sysfs(struct platform_device *device)
 425 {
 426         device_remove_file(&device->dev, &dev_attr_display);
 427         device_remove_file(&device->dev, &dev_attr_hddtemp);
 428         device_remove_file(&device->dev, &dev_attr_als);
 429         device_remove_file(&device->dev, &dev_attr_dock);
 430         device_remove_file(&device->dev, &dev_attr_tablet);
 431 }
 432
 433 static int __init hp_wmi_bios_setup(struct platform_device *device)
 434 {
 435         int err;
 436         int wireless = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, 0);
 437
 438         err = device_create_file(&device->dev, &dev_attr_display);
 439         if (err)
 440                 goto add_sysfs_error;
 441         err = device_create_file(&device->dev, &dev_attr_hddtemp);
 442         if (err)
 443                 goto add_sysfs_error;
 444         err = device_create_file(&device->dev, &dev_attr_als);
 445         if (err)
 446                 goto add_sysfs_error;
 447         err = device_create_file(&device->dev, &dev_attr_dock);
 448         if (err)
 449                 goto add_sysfs_error;
 450         err = device_create_file(&device->dev, &dev_attr_tablet);
 451         if (err)
 452                 goto add_sysfs_error;
 453
 454         if (wireless & 0x1) {
 455                 wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
 456                                            RFKILL_TYPE_WLAN,
 457                                            &hp_wmi_rfkill_ops,
 458                                            (void *) 0);
 459                 err = rfkill_register(wifi_rfkill);
 460                 if (err)
 461                         goto register_wifi_error;
 462         }
 463
 464         if (wireless & 0x2) {
 465                 bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
 466                                                 RFKILL_TYPE_BLUETOOTH,
 467                                                 &hp_wmi_rfkill_ops,
 468                                                 (void *) 1);
 469                 err = rfkill_register(bluetooth_rfkill);
 470                 if (err)
 471                         goto register_bluetooth_error;
 472         }
 473
 474         if (wireless & 0x4) {
 475                 wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
 476                                            RFKILL_TYPE_WWAN,
 477                                            &hp_wmi_rfkill_ops,
 478                                            (void *) 2);
 479                 err = rfkill_register(wwan_rfkill);
 480                 if (err)
 481                         goto register_wwan_err;
 482         }
 483
 484         return 0;
 485 register_wwan_err:
 486         rfkill_destroy(wwan_rfkill);
 487         if (bluetooth_rfkill)
 488                 rfkill_unregister(bluetooth_rfkill);
 489 register_bluetooth_error:
 490         rfkill_destroy(bluetooth_rfkill);
 491         if (wifi_rfkill)
 492                 rfkill_unregister(wifi_rfkill);
 493 register_wifi_error:
 494         rfkill_destroy(wifi_rfkill);
 495 add_sysfs_error:
 496         cleanup_sysfs(device);
 497         return err;
 498 }
 499
 500 static int __exit hp_wmi_bios_remove(struct platform_device *device)
 501 {
 502         cleanup_sysfs(device);
 503
 504         if (wifi_rfkill) {
 505                 rfkill_unregister(wifi_rfkill);
 506                 rfkill_destroy(wifi_rfkill);
 507         }
 508         if (bluetooth_rfkill) {
 509                 rfkill_unregister(bluetooth_rfkill);
 510                 rfkill_destroy(bluetooth_rfkill);
 511         }
 512         if (wwan_rfkill) {
 513                 rfkill_unregister(wwan_rfkill);
 514                 rfkill_destroy(wwan_rfkill);
 515         }
 516
 517         return 0;
 518 }
 519
 520 static int hp_wmi_resume_handler(struct device *device)
 521 {
 522         /*
 523          * Hardware state may have changed while suspended, so trigger
 524          * input events for the current state. As this is a switch,
 525          * the input layer will only actually pass it on if the state
 526          * changed.
 527          */
 528         if (hp_wmi_input_dev) {
 529                 input_report_switch(hp_wmi_input_dev, SW_DOCK,
 530                                     hp_wmi_dock_state());
 531                 input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
 532                                     hp_wmi_tablet_state());
 533                 input_sync(hp_wmi_input_dev);
 534         }
 535
 536         return 0;
 537 }
 538
 539 static int __init hp_wmi_init(void)
 540 {
 541         int err;
 542
 543         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 544                 err = wmi_install_notify_handler(HPWMI_EVENT_GUID,
 545                                                  hp_wmi_notify, NULL);
 546                 if (!err)
 547                         hp_wmi_input_setup();
 548         }
 549
 550         if (wmi_has_guid(HPWMI_BIOS_GUID)) {
 551                 err = platform_driver_register(&hp_wmi_driver);
 552                 if (err)
 553                         return 0;
 554                 hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
 555                 if (!hp_wmi_platform_dev) {
 556                         platform_driver_unregister(&hp_wmi_driver);
 557                         return 0;
 558                 }
 559                 platform_device_add(hp_wmi_platform_dev);
 560         }
 561
 562         return 0;
 563 }
 564
 565 static void __exit hp_wmi_exit(void)
 566 {
 567         if (wmi_has_guid(HPWMI_EVENT_GUID)) {
 568                 wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 569                 input_unregister_device(hp_wmi_input_dev);
 570         }
 571         if (hp_wmi_platform_dev) {
 572                 platform_device_del(hp_wmi_platform_dev);
 573                 platform_driver_unregister(&hp_wmi_driver);
 574         }
 575 }
 576
 577 module_init(hp_wmi_init);
 578 module_exit(hp_wmi_exit);